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Add to FAQ about blocking in a callback #497

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Aug 1, 2023
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Add to FAQ about blocking in a callback #497

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3 changes: 3 additions & 0 deletions documents/FAQ.md
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Expand Up @@ -32,6 +32,9 @@ This could be many different things but it most likely is a policy issue. Start

After getting it working make sure to only allow the actions and resources that you need. More info about IoT IAM policies can be found [here](https://docs.aws.amazon.com/iot/latest/developerguide/security_iam_service-with-iam.html).

### I am experiencing deadlocks
You MUST NOT perform blocking operations on any callback, or you will cause a deadlock. For example: in the on_publish_received callback, do not send a publish, and then wait for the future to complete within the callback. The Client cannot do work until your callback returns, so the thread will be stuck.

### Mac-Only TLS Behavior

Please note that on Mac, once a private key is used with a certificate, that certificate-key pair is imported into the Mac Keychain. All subsequent uses of that certificate will use the stored private key and ignore anything passed in programmatically. Beginning in v1.7.3, when a stored private key from the Keychain is used, the following will be logged at the "info" log level:
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